1040097 - Miller MDX-250 Replacement MIG Gun Neck Assembly

Restore Precision to Your Welding with the Miller MDX-250 Neck Assembly

The Miller MDX-250 Neck Assembly (1040097) is the definitive replacement conductor tube designed specifically for the Miller MDX-250 MIG gun series. In the demanding world of industrial welding, the neck of your MIG gun takes the brunt of the heat, spatter, and mechanical stress. Over time, internal wear or accidental damage can impede wire feeding and disrupt gas flow, leading to porosity and unstable arcs. This genuine replacement assembly ensures that your equipment continues to operate at peak efficiency, maintaining the high standards expected from Miller Electric products.

Engineered for seamless integration, this neck assembly directly replaces the older MIL1040096 part number, offering the same robust specifications and fitment. It is rated for 250 Amps, making it suitable for a wide range of fabrication tasks, from automotive repair to light industrial manufacturing. The assembly is constructed with high-grade copper components to maximize electrical conductivity and heat dissipation, ensuring the gun runs cooler for longer periods.

Optimized for AccuLock™ MDX Performance

One of the key features of the MDX-250 system is its utilization of AccuLock™ MDX consumables. This neck assembly is precision-machined to mate perfectly with AccuLock contact tips and diffusers. This tight tolerance is critical for maintaining the concentricity of the wire within the gas stream, which directly impacts weld quality. By replacing a worn or bent neck with this factory-spec part, you ensure that the contact tip remains centered, reducing keyholing and erratic arc behavior.

Installation and Durability

Swapping out the neck on an MDX-250 is a straightforward process designed to minimize downtime. The assembly fits securely into the gun handle, providing a rigid connection that resists twisting during operation. The outer insulation is resistant to high heat and impact, protecting the internal conductor from the harsh workshop environment. whether you are dealing with a clogged liner path inside the old neck or physical damage from a drop, this replacement part restores the ergonomic balance and functional reliability of your torch.

• Genuine Compatibility: Guaranteed fit for Miller MDX-250 MIG guns.


• Enhanced Wire Feeding: Smooth internal bore reduces drag on the welding wire.


• Thermal Efficiency: Superior materials manage heat buildup effectively.


• Complete Assembly: Ready to install out of the box.